捕捉摄像头并保存视频

转发

#include<stdio.h>

#include "cv.h"
#include "highgui.h"
#include<iostream>
using namespace std;


int main()
{
CvCapture* capture = cvCaptureFromCAM(0);//-1有时会失败
CvVideoWriter* video = NULL;
IplImage* frame = NULL;
int n;
if (!capture) //如果不能打开摄像头给出警告
{
cout<<"jjd" <<endl;
return -1;
}
else
{
//cvWaitKey(30);
frame = cvQueryFrame(capture); //首先取得摄像头中的一帧
video = cvCreateVideoWriter("camera.avi", CV_FOURCC('D', 'I', 'V', 'X') , 32,        //解码器DIVX，电脑上没有请到官网下载，否则创建失败。
cvSize(frame->width,frame->height)); //创建CvVideoWriter对象并分配空间
 //保存的文件名为camera.avi，编码要在运行程序时选择，大小就是摄像头视频的大小，帧频率是32
if (video) //如果能创建CvVideoWriter对象则表明成功
{
cout << "VideoWriter has created." << endl;
}
cvNamedWindow("Camera Video", 1); //新建一个窗口
while (1)
{
//cvWaitKey(30);
frame = cvQueryFrame(capture); //从CvCapture中获得一帧
if (!frame)
{
cout << "Can not get frame from the capture." << endl;
break;
}
n = cvWriteFrame(video, frame); //判断是否写入成功，如果返回的是1，表示写入成功
cout << n << endl;
cvShowImage("Camera Video", frame); //显示视频内容的图片
if (cvWaitKey(2) > 0) break; //有其他键盘响应，则退出
}
cvReleaseVideoWriter(&video);
cvReleaseCapture(&capture);
cvDestroyWindow("Camera Video");
}
return 0;
}